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authorMilan Broz <mbroz@redhat.com>2006-09-04 17:37:57 +0400
committerJens Axboe <axboe@nelson.home.kernel.dk>2006-09-30 22:52:33 +0400
commit50be345560f1ffdcb15cc0e146416b80529a2ef2 (patch)
tree056278d82ea7fcbd26d9cc95c806d3978bbbb56e
parentbcfd8d36151e531e1c6c731f1fbf792509a1c494 (diff)
downloadlinux-50be345560f1ffdcb15cc0e146416b80529a2ef2.tar.xz
[PATCH] fix creating zero sized bio mempools in low memory system
In the very low memory systems is in the init_bio call scale parameter set to zero and it leads to creating zero sized mempool. This patch prevents pool_entries parameter become zero, so the created pool have at least 1 entry. Mempool with 0 entries lead to incorrect behaviour of mempool_free. (Alloc requests are not waken up and system stalls in mempool_alloc->ioschedule). Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--fs/bio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/bio.c b/fs/bio.c
index 6a0b9ad8f8c9..52de79c29942 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -1142,7 +1142,7 @@ static int biovec_create_pools(struct bio_set *bs, int pool_entries, int scale)
struct biovec_slab *bp = bvec_slabs + i;
mempool_t **bvp = bs->bvec_pools + i;
- if (i >= scale)
+ if (pool_entries > 1 && i >= scale)
pool_entries >>= 1;
*bvp = mempool_create_slab_pool(pool_entries, bp->slab);